Remove use of goog.object.setIfUndefined()

src/ol/xml.js

@@ -3,7 +3,6 @@ goog.provide('ol.xml');
 goog.require('goog.asserts');
 goog.require('goog.dom.NodeType');
 goog.require('goog.dom.xml');
-goog.require('goog.object');
 goog.require('goog.userAgent');
 goog.require('ol.array');
 
@@ -454,7 +453,12 @@ ol.xml.makeObjectPropertyPusher = function(valueReader, opt_property, opt_this)
               opt_property : node.localName;
           goog.asserts.assert(goog.isObject(object),
               'entity from stack was not an object');
-          var array = goog.object.setIfUndefined(object, property, []);
+          var array;
+          if (property in object) {
+            array = object[property];
+          } else {
+            array = object[property] = [];
+          }
           array.push(value);
         }
       });